Coupled oscillations of vortex cores confined in a ferromagnetic elliptical disk

Hiroshi Hata, Minori Goto, Akinobu Yamaguchi, Tomonori Sato, Yoshinobu Nakatani, Yukio Nozaki

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

By solving the Thiele equation with simultaneous application of a radio-frequency (rf) magnetic field (hrf) and an rf spin current (jsp), the dynamic susceptibility of exchange-coupled vortices in response to hrf and jsp was obtained. It was found that the four eigenmodes expected for two vortices trapped in a magnetic elliptical disk were coupled to different components of hrf and jsp. As a consequence, orthogonal hrf and jsp (which are simultaneously generated by the application of an rf current to an elliptical disk) can excite two modes with different eigenfrequencies. This result suggests that a fieldlike nonadiabatic torque caused by an rf spin current can be spectroscopically distinguished from the one caused by the rf magnetic field.

Original languageEnglish
Article number104418
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number10
DOIs
Publication statusPublished - 2014 Sep 22

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radio frequencies
Vortex flow
vortices
oscillations
trapped vortices
Magnetic fields
magnetic fields
torque
Torque
magnetic permeability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Coupled oscillations of vortex cores confined in a ferromagnetic elliptical disk. / Hata, Hiroshi; Goto, Minori; Yamaguchi, Akinobu; Sato, Tomonori; Nakatani, Yoshinobu; Nozaki, Yukio.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 10, 104418, 22.09.2014.

Research output: Contribution to journalArticle

Hata, Hiroshi ; Goto, Minori ; Yamaguchi, Akinobu ; Sato, Tomonori ; Nakatani, Yoshinobu ; Nozaki, Yukio. / Coupled oscillations of vortex cores confined in a ferromagnetic elliptical disk. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 10.
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